Most of the known brands such as Denon, HK, Sherwood, Pioneer, Onkyo ect...should all be fine with the M60's. Denon seems to be the most popular AVR here, with a sprinkle of Onkyos but that's partly because of the fact that many users here have M80's which dip a little lower to approx 4ohms. Many of the better AVRs have high current capability these days(but not all).

Half of communication is listening. You can't listen with your mouth.